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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb766187e5fcdc4c0962e15d380bc9c1cbc8914531a00dce72f500d1e1f52c2' 
  AND token = 'vkpndOp6EkscGj4BpFsArzgaBqbE0T2XkCHN4KfGMRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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