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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266c6c20ac3522ab6ff4051517047c2f34a18a1f9b00d156d4fd8cbdc959c3e1' 
  AND token = 'vx8l8NozlXecsjtGt12hjpItXL/wGO4U1oqPRZ640ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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