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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c32f6ac61a0e0df60999458dac5fb7ab0ec75b530c4098f2a3ca9dc25a6550e' 
  AND token = 'Bjj9lIkrQ954wQin263Z32iP+TguX3Dh90kVWjcntiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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