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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ecd6db6eb5b2539e0ad18167652094eb6d37972c4c2801470b3b0acd0ab3ce' 
  AND token = '0Ksw3TB2VS+inUEfG4czILJ4DgGeXrxH+sT1n9rV83U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}