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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ab169290a147bfe56f96e12be70323d3deb408aae44eb074d502d3e5e823db' 
  AND token = 'Zl7pVgVB83tjPhPf/18GmW6+HpsoTEuDM2DOKa5rC98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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