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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e0f814fcf671d179cb692a220ccd19af506be4e36a8fd43bb1721b03cea3a2' 
  AND token = '9QKZp0IVLDy+NZqxG0F9NFlf+RbYVoTLON1Ih1w/O60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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